Alaska earthquakes

M4.7 earthquake 111 km S of Atka, Alaska

A magnitude 4.7 earthquake struck 111 km S of Atka, Alaska on Wed, Nov 18, 1987, 7:04 AM HAST (17:04 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.0 81 km SE of Atka, AK. This one was a foreshock.

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The earthquake

Magnitude
4.7 (mb), light
Local time
UTC
1987-11-18 17:04:19 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.197° N, 174.314° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Depth from
OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 1.7 and up: 11 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 5.081 km SE of Atka, AK · 14179 days ago · 33 km deep · 75 km away
  2. 4.6114 km SE of Adak, Alaska · 14172 days ago · 33 km deep · 74 km away
  3. 5.0135 km SSW of Atka, Alaska · 14162 days ago · 33 km deep · 53 km away
  4. 4.397 km SW of Atka, Alaska · 14151 days ago · 33 km deep · 69 km away
  5. 5.595 km SSW of Atka, Alaska · 14132 days ago · 33 km deep · 31 km away
  6. 5.5103 km SSW of Atka, Alaska · 14132 days ago · 33 km deep · 27 km away
  7. 5.2103 km SSW of Atka, Alaska · 14132 days ago · 33 km deep · 31 km away
  8. 5.1100 km SSW of Atka, Alaska · 14132 days ago · 33 km deep · 29 km away
  9. 4.735 km WSW of Atka, Alaska · 14132 days ago · 33 km deep · 97 km away
  10. 5.383 km SSW of Atka, Alaska · 14132 days ago · 33 km deep · 44 km away
  11. 5.193 km SSW of Atka, Alaska · 14132 days ago · 33 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0003a8d. Read Tue, Sep 22, 2026, 7:04 AM UTC.